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University of California
California Aquatic Invasive Species (AIS)
Invasive Seaweeds and Hull Fouling Species
Sargassum horneri - Visit algaeBASE for full scientific classification.
- Occurs in the intertidal zone and down to depths of 100 feet.
Invasion Pathways and Distribution
- Native to warm seas in Japan and Korea.
- Extensive natural dispersal capabilities via drifting fragments.
- Can spread by attaching to vessel hulls or by drifting.
- Invasive in Baja California, Mexico, southern California, and the California Channel Islands.
- First reported in California in 2003.
- Capable of self-fertilization.
- Young plants grow from embryos released from numerous, conspicuous, chili pepper-shaped reproductive structures.
- Completes its life cycle in approximately one year.
- Spreads quickly.
- Areas in southern California currently dominated by this species that thrives in warm water conditions.
- Competes with natives for space and light.
References and Useful Links
For references by category and links to other useful AIS sites see our LEARN MORE page.
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